Enable building with travis, use a build matrix to select platform.

Per the travis user documentation at
* http://docs.travis-ci.com/user/languages/java/
* http://docs.travis-ci.com/user/build-configuration/#The-Build-Matrix

..we enable several parallel builds using the latest cloudera CDH
versions supported by the latest bento (ebi 2.0.1).

All builds are run with Oracle JDK 7 (travis no longer offers JDK 6
since its End of Life.)
Apt-repos, install hdfs, mr1 and hbase.
Turn off everything except cdh4.4.0 while I hack up the scripts.